I keep hearing that carbs are the body’s fuel, but fats contain more calories per gram. Surely that means fat is the body’s primary source of fuel?
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Calories is a unit of energy like Joules, Wh, or any other unit you like to use. For food, it is a measurement of the available energy a human can use. The food calorie is technically a kilocalorie and is by definition 4184 Jules.
It is a way we humans quantify something just like we use, a meter or any other unit for measuring distance. So a Calorie is nothing by itself but a measurement of how much usable energy our body can extract from it
Out body can extract usable energy from carbohydrates, fat, proteins, alcohol, it might possible to use more stuff I am not sure.
What we use to power use will depend on what we eat. So if you eat primary carbohydrates is it what you primarily use. If you just eart meat more of it will come from proteins and fat.
The energy density of it is not what is important it is what you body have access to and how hard it is to use it.
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